Grinding attachment for hand-drills.



G. H. SAWYBR; GRINDING ATTACHMENT FOR HAND DRILLS. D

APPLICATION FILED MAR. 28, 1914.

1,121,671. I Patented Dec.22,1914

uoemtoc GEORGE H .SHWYER. q/qn tmaooeo (Mm m W v I 6361mm:

-' rrnn STATES GEORGE H. SAWYER, or PORT ALLEGANY, PENNSYLVANIA.

GRINDING ATTACHMENT FOR I-IANID-DRILLS.

Specification of Letters Patent.

Patented Dec. 22,1914.

Application filed. March as, 1914.. Serial No. 828,017.

To all whom it may concern:

Be it known that I, Gnonen H. SAWYER, a citizen of the United States, residing at Port Allegany, in the county of McKean and State of Pennsylvania, have invented certain new and useful Improvements in Grinding Attachments for Hand-Drills, of which the following is a specification, reference being had to the accompany'ingdraw- 1ngs.

This invention relates to new and useful improvements in electric hand drills, and more particularly to grinding attachments therefor.

An object of this invention is the provision of a grinding attachment for handdrills which may be quickly applied to the mandrel of the drill upon removal of the drill bit therefrom.

Another object of this invention is the provision of a grinding attachment for hand drills which comprises a minimum number of parts, whereby it may be cheaply manufactured and one which will be efficient in operation. 7

With these and other objects in View, my invention consists in the novel construction, combination, and arrangement of parts, to be hereinafter more fully described, claimed, and illustrated in the accompanying drawing, in which,

Figure 1 is an elevation of my improved attachment, showing the same connected to the handle of a hand drill; Fig. 2 is a longitudinal section thereof; Fig. 3 is an end view; and Fig. 4 is a sectional view on the line 44 of Fig. 2.

Referring more particularly to the drawing, the numeral 1 designates the outer end of the tubular mandrel or shaft of an electric hand drill, and 2 the sleeve which encircles the mandrel and which provides a handle for the operator.

3 designates the grinding shaft of my 1mproved attachment, and projecting transversely through the shaft is a pin 4, the opposite ends of which project radially from the shaft as at 5. The inner end of the shaft 3-is adapted for insertion into the outer end of the mandrel 1, the mandrel being provided in its outer end with diametrically oppositenotches 6 whlch receive the projecting ends of the pin 5, the opposite ends of the pin extending to the outer periphery of the mandrel. I

To securely and detachably hold the shaft 3 in the outer end of the mandrel 1, is a, sleeve 7, the sleeve being provided with a longltudinally extending peripheral flange 8 which forms a shoulder 9 at the inner end of the sleeve. The flange 8 is interiorly threaded as at 10, for engagement with the exterior threads on the outer end of the mandrel 1, and the sleeve 7 is adapted to be threaded upon the end of the mandrel until 7 the shoulder 9 engages the end wall of the mandrel and the outer faces of the projecting portions of the pin 4, whereby the shaft 3 is detachably secured within the mandrel. The outer end of the shaft 3 is threaded as at 11, and a washer or gasket 12 is threadably disposed over the outer end of the shaft 3 to rest against the outer end of the sleeve 7. The grinding wheel 13 which is composed of emery or other similar abrasive material is then disposed upon the shaft against the gasket 12 and a nut 14 is threadably mounted uponthe outer end of the shaft 3 and turned thereon to engage the grinding wheel 13 to hold the same in position on the grinding shaft.

In the operation of my improved device, when it is desired to apply my attachment to the mandrel of a hand drill, the drill shank and screw collar (not shown) of a hand drill are removed from the outer end of the mandrel 1, and the inner end of the shaft 3 is disposed within the outer end of the mandrel so that the opposite ends of the pin 5 engage in the notches 6 in the mandrel. The sleeve 7 is then disposed on the shaft 3 so that the threads on the flange of the sleeve threadably engage on the threads on the outer end of the mandrel, and the grinding wheel 13 is connected to the outer projecting end of the shaft 3, as hereinbefore described. The operator may then support the device by grasping the sleeve 2 on the mandrel in the ordinary manner and the handle rotated in the usual manner so that the grinding wheel 13 may be engaged with a drill bit (not shown) to sharpen the same.

Having thus fully described my invention, what I desire to secure and claim by Letters Patent is 1. In combination with a tubular mandrel of a hand drill machine having its outer end exteriorly threaded, of a shaft having its inner end loosely disposed within the outer end of said mandrel, a pin extending transversely through said shaft for engagement against the outer end of said mandrel at diametrically opposite points, means adapted for threadable engagement 'Wltll the exterior threads of said mandrel to bear against. the opposite ends of said pin whereby the shaft is held in position Within the mandrel, and an'abrasiv'e Wheel detachably connected to the outer end of said shaft.

2. In combination with a tubular mandrel,

" said mandrel being threaded on its outer end and having a pair of diametrically opposite notches formed therein, of a shaft having its inner end disposed in the outer end of said mandrel, a pin projecting transversely through said shaft and, having its opposite ends disposed in said notches, a sleeve mounted on said shaft, said sleeve having a longitudinally extending peripheral threaded flange for engagement With the exterior threads on said mandrel, the inner end of. said sleeve being adapted to engage the outer end of said mandrel, and an abrasive GEORGE H; SAWYER, Witnesses: Y

C. W. CA'rLIN', G; H. GENTZER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Bat'entt, Washington, D. G. 

